223/556

When loading for my ar 15's my manual has data for regular 223 but also a service rifle section. Can i load off either? The service rifle section only has heavier grain bullets but im wanting to load 55gr. Thanks

What's stamped on your Ar? 5.56 or .223?

Is your rifle chambered 223 rem or 5.56 NATO? Load based on the appropriate clambering. My Hornady manual has 223 rem, 223 rem service rifle( writeup says loads tailored for AR-15 chambered in 223rem. 5.56 NATO section cautions to only use these loads in AR-15 type rifles chambered 5.56 NATO. Be cautious as you go start low in the data and work your way up. Watch for pressure signs at each step of the way. Have fun shooting

They both shoot 223 and 556 im just trying to figure out the load data. Because i have a 223 load data and a service rifle load data

You missed the question. What is your barrel stamped/chambered for? .223 or 5.56? 5.56 is a much higher pressure round than .223 therefore it's much safer and acceptable to load/shoot .223 in a barrel chambered for 5.56 than the other way around. Once you determine this you should load accordingly.

Thanks Wiley,i didn't want to be "that guy". What powder primer bullet you loading Dk25?

Try 25.0 - 25.6 (Max) gr of either H335 or TAC with 55 gr bullets. CCI 450 primers. Gets 2800 - 2850 in my 16" Sig Sauer 516.

Sorry about that. There stamped 556. I got cfe223 and varget powder, cci primers. hornady 55gr fmj-bt

A 5.56 chamber can shoot .223 or 5.56 they are identical in dimension the 5.56 is loaded hotter but a .223 is only tested to shoot .223 pressure reloads and a higher pressure 5.56 load may damage the rifle. So if your stamped 5.56 your GTG with either one you choose.